khat or qat 
(kät)
(kät)n.
1. An evergreen shrub (Catha edulis) native to tropical East Africa and Arabia, having dark green opposite leaves that contain cathinone and other stimulants.
2. The leaves of this plant, chewed for their stimulating effect.
[Arabic qāt; akin to Amharic and Tigrinya č̣āt.]